New Particulate Matter Sensor for On Board Diagnosis

Kondo, A.; Yokoi, Shoji; Sakurai, Takayuki; Nishikawa, Satoshi; Egami, Takashi; Tokuda, M.; Sakuma, T.

doi:10.4271/2011-01-0302

Cited by 32 publications

(15 citation statements)

References 2 publications

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“…Adapted from Kubinski and Visser (2008); reprinted with permission from Elsevier. 2010; Kondo et al, 2011;Husted et al, 2012;Bartscherer and Moos, 2013). The resistance between these electrodes is analyzed.…”

Section: Gas Dosimeters Based On Percolation Effectsmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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Abstract. The aim of this article is to introduce the operation principles of conductometric solid-state dosimeter-type gas sensors, which have found increased attention in the past few years, and to give a literature overview on promising materials for this purpose. Contrary to common gas sensors, gas dosimeters are suitable for directly detecting the dose (also called amount or cumulated or integrated exposure of analyte gases) rather than the actual analyte concentration. Therefore, gas dosimeters are especially suited for low level applications with the main interest on mean values. The applied materials are able to change their electrical properties by selective accumulation of analyte molecules in the sensitive layer. The accumulating or dosimeter-type sensing principle is a promising method for reliable, fast, and long-term detection of low analyte levels. In contrast to common gas sensors, few devices relying on the accumulation principle are described in the literature. Most of the dosimeter-type devices are optical, mass sensitive (quartz microbalance/QMB, surface acoustic wave/SAW), or field-effect transistors. The prevalent focus of this article is, however, on solid-state gas dosimeters that allow a direct readout by measuring the conductance or the impedance, which are both based on materials that change (selectively in ideal materials) their conductivity or dielectric properties with gas loading. This overview also includes different operation modes for the accumulative sensing principle and its unique features.

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Section: Gas Dosimeters Based On Percolation Effectsmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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“…In the future, the regulation asks for a permanent monitoring of the function of the after‐treatment system. The first prototypes, based on such resistivity sensors, are under study 39–41. The exhaust aerosol becomes deposited onto an interdigital electrode sensor positioned behind the diesel particulate filter of the after‐treatment system and the conductance is continuously measured on board.…”

Section: Soot Characterization By Conductivity Measurementsmentioning

confidence: 99%

“…electrical conductivity differs by four orders of magnitude depending on soot production conditions; under development for on‐board diagnosis of exhaust after‐treatment functionality36, 39–41…”

Section: Introductionmentioning

confidence: 99%

The Many Faces of Soot: Characterization of Soot Nanoparticles Produced by Engines

Niessner

2014

Angew Chem Int Ed

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Soot nanoparticles produced by engines constitute a threat to human health. For the analytical chemist, soot is a hard nut to crack as the released particles undergo rapid changes in their size, shape, and number concentration. The complete characterization of soot will be essential to meet future low-emission standards. Besides measuring the light extinction, modern analytical chemistry can determine a variety of less-known effects, such as condensation properties, immune response in vertebrates, and impact on the cardiovascular function of a beating heart. Photon emission and in particular Raman spectroscopy provides information on the nanocrystallinity, while thermoelectron emission allows the number of electrical particles to be counted. Even the "simple" combustion of soot nanoparticles offers potential for the characterization of the particles.

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“…For some modern vehicles on which nitrogen oxides (NO x ) sensors are available (for both gasoline and diesel vehicles) (Kato et al, 1997), the amount of NO x emitted can also be collected and examined. As exhaust gas sensors for on-board measurement are developing rapidly (e.g., carbon monoxide sensors (Nakamura et al, 2002), particulate matter/ soot sensors (Kondo et al, 2011;Minagawa et al, 2014), hydrocarbon sensors (Wiegärtner et al, 2014)), it is believed that more exhaust gas sensors will soon be commonly added to the vehicles. Therefore, the proposed inspection system should be very promising.…”

Section: Introductionmentioning

confidence: 99%